A variational principle for transition and density matrices and approximations to the equations-of-motion |
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Authors: | Yuri Dmitriev Bjrn Roos |
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Institution: | Yuri Dmitriev,Björn Roos |
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Abstract: | A general variational principle for transition and density matrices is proposed. The principle is closely related to Rowe's variational treatment of the equations-of-motion method. It permits the simultaneous construction of coupled approximations for two eigenstates, and it is a straightforward extension of the usual variational method. |
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